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On man-made structures, such as church roofs, it was sometimes inappropriate to install a rivet into the existing fabric of the building. In such cases, an asphalt disc was poured onto the surface and the rivet installed in that [1].
There are 129 Discs listed in the TP:UK database. This total may be incremented when roof stations, listed in OSGB36 as rivets, are identified as discs, for example Manor Farm Observation Tower.
An example of a Disc is on the turret roof of St Ninian's Church on the Isle of Man.